Contrast ratio results for Dell S2340m

Black
Contrast ratio	907:1 (edge: 282:1)
Monitor model	Dell S2340m
Submitted	25 Nov 2012 08:07 CET, by 209.215..
Camera model	Nikon D7000
Processing remarks	image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: Image F-number settings are not the same.
Screen photo	[open image]
Luminance	0.22 cd/m2
Luminance spread	0.06 cd/m2 (2 standard deviations)
Exposure value	–1.66 stops (aim for –2 to –3)
Exposure spread	0.37 stops
Area used for calculation	0.388 x 0.439
Camera settings	Exposure time: 15 ISO: 100 F-number: 3.5 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -1
White
Screen photo	[open image]
Luminance	200 cd/m2
Luminance spread	40 cd/m2 (2 standard deviations)
Exposure value	–2.39 stops (aim for –2 to –3)
Exposure spread	0.29 stops
Area used for calculation	0.388 x 0.439
Camera settings	Exposure time: 1/100 ISO: 100 F-number: 3.5 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -3
Black at screen edge
Screen photo	[open image]
Luminance	0.71 cd/m2
Luminance spread	2.82 cd/m2 (2 standard deviations)
Exposure value	–2.95 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.388 x 0.439
Camera settings	Exposure time: 2.5 ISO: 100 F-number: 4 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -2

The luminance values in cd/m2 are not very reliable, since camera sensitivities can easily differ up to 50% from their nominal value. Typically, the real luminance is 30% lower than this number. The area used for calculation is chosen such that it corresponds to a viewing angle of ±14° horizontally and ±10.5° vertically, which is equivalent to viewing the screen from a distance of about 1.5 times the diagonal size.

Unfortunately, there is a lot of variation in how cameras use EXIF settings. If photos from your camera your produce unusable results, try coming back in a few days. I review submitted pictures regularly and try to fix problems.